Vision-based identification and locating method for outer beam holes in multilayer beam

Abstract

The invention belongs to the field of machine vision and detection, and discloses a vision-based identification and locating method for outer beam holes in a multilayer beam. The method comprises the steps of (a) calculating a conversion coefficient for converting an actual size into a pixel size; (b) selecting a generation template in a to-be-identified outer beam hole of the multilayer beam, performing template matching on a to-be-identified image, obtaining a size type of the hole, intercepting a new local image by taking an optimal matching point as a center, and performing sub-pixel precision-level edge detection on the new image; and (c) fitting central coordinates of the hole by using edge point data, and performing multiplication by the conversion coefficient to obtain the central coordinates of the to-be-identified outer beam hole of the multilayer beam, thereby realizing the identification and locating of the hole. Through the method, automatic blind hole identification and locating of the outer beam holes in the multilayer beam are realized, the labor intensity of workers is reduced, the machining precision of the outer beam holes and the riveting quality of the multilayer beam are improved, and the production efficiency is improved by multiple times.

Description

technical field [0001] The invention belongs to the field of machine vision and detection, and more specifically relates to a vision-based identification and positioning method for inner and outer beam holes in multi-layer beams. Background technique [0002] Multi-story beams, especially double-deck beams, are a common large load-bearing structure. Multi-layer beams are riveted by multiple pieces of single-layer beams. Compared with single-layer beams, multi-layer beams have higher strength, so they are widely used in automobile frames, bridges, large truss buildings and other load-bearing structures. In order to reduce or even eliminate the dislocation of the holes to be riveted and improve the quality of multi-layer beams, the multi-layer beam hole matching process puts forward high requirements on the center coincidence degree and hole diameter error of the holes to be riveted on each single-layer beam. For example, the double-layer steel beams used in commercial vehicl...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a vision-based identification and positioning method for the middle and outer beam holes of multi-storey beams, which can be automatically identified by robot vision, thus solving the identification of the size of the middle and outer beam holes of multi-storey beams and positioning technical issues

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